Detectives

This photo released by the Defense Department shows detectives assigned to the Fort Hood Directorate of Emergency Services responding to a shooter barricaded in the post's deployment readiness center, Thursday at Ft. Hood, Texas.

This photo released by the Defense Department shows detectives assigned to the Fort Hood Directorate of Emergency Services responding to a shooter barricaded in the post's deployment readiness center, Thursday at Ft. Hood, Texas. (Andrew Evans / Defense Department)

This photo released by the Defense Department shows detectives assigned to the Fort Hood Directorate of Emergency Services responding to a shooter barricaded in the post's deployment readiness center, Thursday at Ft. Hood, Texas.Andrew Evans / Defense Department